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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c6defd37fea6a9d9a6a2096fd3b9930217a9af1c56dfbf47abbbd55ec8c87' 
  AND token = '2hUlfZFjOpiZamnM806cM63jaWN8/yD+5j31Czkeif4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}